TW567665B - Longitudinally-coupled resonator surface acoustic wave filter and communication system using the filter - Google Patents
Longitudinally-coupled resonator surface acoustic wave filter and communication system using the filter Download PDFInfo
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- TW567665B TW567665B TW091111413A TW91111413A TW567665B TW 567665 B TW567665 B TW 567665B TW 091111413 A TW091111413 A TW 091111413A TW 91111413 A TW91111413 A TW 91111413A TW 567665 B TW567665 B TW 567665B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/0023—Balance-unbalance or balance-balance networks
- H03H9/0028—Balance-unbalance or balance-balance networks using surface acoustic wave devices
- H03H9/0033—Balance-unbalance or balance-balance networks using surface acoustic wave devices having one acoustic track only
- H03H9/0042—Balance-unbalance or balance-balance networks using surface acoustic wave devices having one acoustic track only the balanced terminals being on opposite sides of the track
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/0023—Balance-unbalance or balance-balance networks
- H03H9/0028—Balance-unbalance or balance-balance networks using surface acoustic wave devices
- H03H9/0033—Balance-unbalance or balance-balance networks using surface acoustic wave devices having one acoustic track only
- H03H9/0038—Balance-unbalance or balance-balance networks using surface acoustic wave devices having one acoustic track only the balanced terminals being on the same side of the track
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/0023—Balance-unbalance or balance-balance networks
- H03H9/0028—Balance-unbalance or balance-balance networks using surface acoustic wave devices
- H03H9/0047—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks
- H03H9/0066—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks being electrically parallel
- H03H9/0071—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks being electrically parallel the balanced terminals being on the same side of the tracks
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
- H03H9/14544—Transducers of particular shape or position
- H03H9/14576—Transducers whereby only the last fingers have different characteristics with respect to the other fingers, e.g. different shape, thickness or material, split finger
- H03H9/14582—Transducers whereby only the last fingers have different characteristics with respect to the other fingers, e.g. different shape, thickness or material, split finger the last fingers having a different pitch
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
- H03H9/14544—Transducers of particular shape or position
- H03H9/14588—Horizontally-split transducers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6423—Means for obtaining a particular transfer characteristic
- H03H9/6433—Coupled resonator filters
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- Acoustics & Sound (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
Description
A7 567665 ____B7________ 五、發明說明（/ ) 〔技術領域〕 本發明係關於縱耦合諧振器型表面波濾波器以及使用 其之通訊機裝置。 〔背景技術〕 近年來，在行動電話等的通訊機裝置中，隨著參加者 的增加和服務的多樣化，有發送側頻帶和接收側頻帶接近 者。還有，依通訊機裝置的種類，爲防止與其他的通訊機 裝置間的干擾，有時在極靠近通帶處必須有一定以上的衰 減量。因此，作爲行動電話的RF頻段的帶通濾波器所廣 泛採用之彈性表面波濾波器，也強烈要求將極靠近通帶處 的衰減量增大到一定量以上。 另一方面，對於彈性表面波濾波器，以削減零件數爲 目的，強烈要求具有平衡一不平衡信號轉換功能、即具備 所謂巴闌(balun)的功能。例如，在日本特開平5-267990號 公報中已揭示具有這種平衡-不平衡信號轉換功能的縱耦 合諧振器型彈性表面波濾波器。 但是，在上述般以往的縱耦合諧振器型彈性表面波濾 波器中，在比通帶更高頻區域側會出現稱作橫向響應的肩 特性惡化（頻率特性的急劇惡化）。因此，在Pcs ( Personal Communication System)(個人通訊系統）方式的 通訊機裝置等中，會有所要求之比通帶更高頻側的衰減量 無法取大的問題。爲了解決這個問題，作爲將比通帶更高 頻側的衰減量加大的濾波器，係例如在日本特開平1〇_ 126212號公報中揭示的梯形彈性表面波濾波器。但是，在 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 2973公釐） 一—— (請先閱讀背面之注意事項再填寫本頁)A7 567665 ____B7________ 5. Description of the Invention (/) [Technical Field] The present invention relates to a longitudinally coupled resonator-type surface wave filter and a communication device using the same. [Background Art] In recent years, in communication devices such as mobile phones, as the number of participants increases and the services are diversified, there are those who have a transmission frequency band and a reception frequency band close to each other. In addition, depending on the type of the communication device, in order to prevent interference with other communication devices, it is necessary to have a certain amount of attenuation near the passband in some cases. Therefore, the surface acoustic wave filter widely used as a band-pass filter in the RF band of a mobile phone also strongly requires that the attenuation amount close to the pass band be increased to a certain amount or more. On the other hand, in order to reduce the number of parts, a surface acoustic wave filter is strongly required to have a balanced-unbalanced signal conversion function, that is, a so-called balun function. For example, Japanese Patent Application Laid-Open No. 5-267990 has disclosed a longitudinally coupled resonator-type surface acoustic wave filter having such a balanced-unbalanced signal conversion function. However, in the conventional longitudinally-coupled resonator-type surface acoustic wave filter described above, a shoulder characteristic called a lateral response deterioration (a sharp deterioration in frequency characteristics) occurs at a higher frequency region side than the passband. Therefore, there is a problem that in a communication device such as a Pcs (Personal Communication System) system, the amount of attenuation on the higher frequency side than the passband cannot be increased. In order to solve this problem, as a filter that increases the amount of attenuation on the higher frequency side than the passband, for example, a trapezoidal surface acoustic wave filter disclosed in Japanese Patent Application Laid-Open No. 10-126212. However, the Chinese National Standard (CNS) A4 specification (210 X 2973 mm) applies to this paper size.-(Please read the precautions on the back before filling this page)
567665 A7 B7 五、發明說明（2 ) 這個梯形彈性表面波濾波器中，會有不能構成平衡一不平 衡信號轉換功能的問題。即在以往的技術中，要構成比通 帶更高頻側的衰減量充分、且具有平衡一不平衡信號轉換 •功能的彈性表面波濾波器，是有困難的。 本發明的縱耦合諧振器型彈性表面波濾波器，是鑒於 上述問題而製作者，提供能使橫向響應比以往的彈性表面 波濾波器大幅地降低、同時具有平衡一不平衡信號轉換功 能的縱耦合諧振器型彈性表面波濾波器。 〔用以解決課題之手段〕 爲達到上述目的，本發明的彈性表面波濾波器，係具 有壓電基板、和在壓電基板上沿彈性表面波的傳播方向排 列的至少兩個IDT(叉指式換能器）；其特徵在於：在IDT等 中至少一個IDT內，設置金屬化比與該IDT的其他電極指 的金屬化比不同的電極指。 還有，在本發明的特定形態中，在該IDT等中相互鄰 接的IDT的至少一方IDT內，將金屬化比與該IDT的其他 電極指的金屬化比不同的電極指，設置在從該IDT的鄰接 部分到該IDT的1/4左右爲止的區域。 還有，在本發明的特定形態中，在IDT等中至少一個 ID丁內，使電極指的金屬化比在彈性表面波的傳播方向呈 連續地變化。 由此，能獲得降低橫向的響應、通帶高頻側的衰減量 大的縱耦合諧振器型彈性表面波濾波器。這時，藉由使電 極指的金屬化比在彈性表面波的傳播方向連續地變化’不 _ _ Λ 本纸張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填寫本頁)567665 A7 B7 V. Description of the invention (2) In this trapezoidal surface acoustic wave filter, there is a problem that it cannot constitute a balanced-unbalanced signal conversion function. That is, in the conventional technology, it is difficult to construct a surface acoustic wave filter having sufficient attenuation at a higher frequency side than the passband and having a balanced-unbalanced signal conversion function. The longitudinally coupled resonator-type surface acoustic wave filter of the present invention has been made in view of the above problems, and provides a longitudinally coupled resonator that can greatly reduce the lateral response compared with the conventional surface acoustic wave filter and has a balanced-unbalanced signal conversion function. Coupled resonator type surface acoustic wave filter. [Means for Solving the Problems] In order to achieve the above object, the surface acoustic wave filter of the present invention includes a piezoelectric substrate and at least two IDTs (interdigital fingers) arranged along the propagation direction of the surface acoustic wave on the piezoelectric substrate. Type transducer); characterized in that: at least one IDT among the IDTs is provided with an electrode finger having a metalization ratio different from that of other electrode fingers of the IDT. Further, in a specific aspect of the present invention, an electrode finger having a metallization ratio different from the metallization ratio of the other electrode fingers of the IDT is provided in at least one IDT adjacent to the IDT among the IDTs. The area adjacent to the IDT is about 1/4 of the IDT. In a specific aspect of the present invention, the metallization ratio of the electrode fingers is continuously changed in the propagation direction of the surface acoustic wave in at least one of the IDTs. This makes it possible to obtain a longitudinally coupled resonator-type surface acoustic wave filter that reduces the lateral response and has a large amount of attenuation on the high-frequency side of the passband. At this time, by continuously changing the metallization ratio of the electrode fingers in the propagation direction of the surface acoustic wave, 'No _ _ Λ This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) (Please read first (Notes on the back then fill out this page)
567665 玉、發明說明（3 ) 致使通帶內的插入損耗增大，而能達到本發明的效果。 還有，本發明的再其他發明，係裝載著申請專利範圍 1〜3項的縱耦合諧振器型彈性表面波濾波器之通訊機裝置 〇 將本發明的縱耦合諧振器型彈性表面波濾波器使用在 通訊機裝置中，可獲得通信品質佳、可靠性高的通訊機裝 置。 〔發明之實施形態〕 以下，根據圖1到圖12說明本發明實施例的縱親合諧 振器型彈性表面波濾波器。 圖1(a)是表示第1實施例的構成。這個第1實施例是 EGSM-Rx用濾波器的例子。遼有，在以後的第2實施例到 第7實施例中，也以EGSM-Rx用濾波器爲例進行說明。第 1實施例的縱耦合諧振器型彈性表面波濾波器1〇1，係在壓 電基板之40±5°YcutX傳播LiTa〇3基板1〇0上形成由A1電 極構成的IDT和反射器。具體的縱稱合諧振器型彈性表面 波濾波器1〇1的構成，係將連接於接地端子204的電極指 群和連接於信號端子205的竃極指群對向配置’並具備： 沿著彈性表面波的傳播方向排列的二個1DTi〇2、103、ι〇4 ，以及隔著IDT102、103、104來配置的兩個反射器1〇5、 106。還有，IDT102和IDT104係並聯於共通信號端子205 〇 還有，如圖1 (a)所示，IDT103和IDT102相鄰處的 幾根電極指、以及IDT103和IDT104相鄰處的幾根電極指 _____5_-—- (請先閱讀背面之注意事項再填寫本頁)567665 Jade and invention description (3) The insertion loss in the passband is increased, and the effect of the present invention can be achieved. In addition, the present invention is still another invention, which is a communicator device equipped with a longitudinally coupled resonator-type surface acoustic wave filter according to claims 1 to 3. Used in the communication device, a communication device with good communication quality and high reliability can be obtained. [Embodiment of Invention] Hereinafter, a longitudinally-coupled resonator-type surface acoustic wave filter according to an embodiment of the present invention will be described with reference to Figs. 1 to 12. Fig. 1 (a) shows the structure of the first embodiment. This first embodiment is an example of a filter for EGSM-Rx. In the following second to seventh embodiments, the filter for EGSM-Rx will be described as an example. The longitudinally coupled resonator-type surface acoustic wave filter 100 of the first embodiment is an IDT and a reflector composed of A1 electrodes formed on a piezoelectric substrate 40 ± 5 ° YcutX propagation LiTa 03 substrate 100. A specific longitudinally-coupled resonator-type surface acoustic wave filter 101 is configured by arranging the electrode finger group connected to the ground terminal 204 and the 竃 polar finger group connected to the signal terminal 205 to face each other 'and having: Two 1DTi02, 103, ι04 arranged in the direction of propagation of the surface acoustic wave, and two reflectors 105, 106 arranged across the IDT 102, 103, 104. In addition, IDT102 and IDT104 are connected in parallel to the common signal terminal 205. Also, as shown in Fig. 1 (a), several electrode fingers adjacent to IDT103 and IDT102, and several electrode fingers adjacent to IDT103 and IDT104 _____ 5 _-—- (Please read the notes on the back before filling this page)
張尺度適用中國國家標準（CNS)A4規格（210 X 297公爱） A7 567665 _____B7 _ 五、發明說明（+ ) ，比IDT其他部分的間距要小，構而成窄間距的電極指。 此外，在圖1(a)中，爲使圖簡潔起見，僅表示少量電極指 的根數。 還有，第1實施例的縱耦合諧振器型彈性表面波濾波 器101，係使各個IDT的金屬化比產生變化。 在此，如圖1(b)所示，設IDT的電極指的寬爲dl、使 電極指的間隔寬爲d2時，金屬化比是以d=dl/ (dl + d2) 所表示的値d。 圖2是表示第1實施例的縱耦合諧振器型彈性表面波 濾波器的各個IDT的金屬化比變化的曲線圖。第1實施例 的縱耦合諧振器型彈性表面波濾波器101的各個IDT102， 103，104的電極指的金屬化比，如圖2所示具有從0.54到 0·73的範圍內連續變化的特徵。具體地，對於IDT102，從 左端向右方向使電極指的金屬化比從0.54到0.73連續變化 著。還有，對於IDT103，從IDT103的左端向右方向到中 央部爲止，從0.73到0.54連續變化著，從IDT103的中央 部到右端爲止，從0.54到0.73連續變化著。而且，對於 IDT104,從左端向右方向使電極指的金屬化比從0.73到 0.54連續變化著。 縱耦合諧振器型彈性表面波濾波器101的其他詳細構 成，設由窄間距電極指的間距所決定的波長爲λΙ2、由其他 電極指的間距所決定的波長爲λΐΐ時，是如下般。 交叉寬度W : 47.7λΙ1 IDT102的電極指根數：27根（其中，從右起的4根是 (請先閱讀背面之注意事項再填寫本頁) 0 ----I--訂---------線I應 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） A7 567665 ___B7____ 五、發明說明（女） 窄間距電極指。） IDT203的電極指根數·· 35根（其中，從左起的4根’ 從右起的4根是窄間距電極指。） IDT104的電極指根數：27根（其中，從左起的4根是 窄間距電極指） IDT 波長λΐΐ : 4·19μιη、λΙ2 : 3·86μιη 反射器105、106的波長XR :均爲4·26μηι 反射器1〇5、106的根數：均爲120根 IDT—IDT 間隔（圖 1(a)的 109，110) ·· 0·50λΙ2 IDT—反射器間隔：0.52λΙΙ 反射器的金屬化比：0.55 電極膜厚：0.08λΙ1 在圖3中表示第1實施例的頻率-振幅特性。爲比較 起見，在圖1(a)的構成中，使用將IDT的金屬化比定爲 0.73的以往構成的縱耦合諧振器型彈性表面波濾波器’而 在圖4中表示這個縱耦合諧振器型彈性表面波濾波器的頻 率一振幅特性。還有，以往構成的縱耦合諧振器型彈性表 面波濾波器的詳細構成，與上述所示的第1實施例是相同 的，但爲取得阻抗匹配，將交叉寬度從實施例的47.UI1變 更成35.8λΙ1之處是不同的。 將圖3與圖4相比，第1實施例中在通帶高頻側的 990〜1020MHz (在圖3、圖4中的斜線部分）的衰減量， 相對於在圖4所示的以往構成，有約4dB的改善。這是因 爲，使IDT內電極指的金屬化比連續變化，而降低橫向響 ___ 7 _ —_ 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填寫本頁) -------訂---------線」 567665 A7 B7____ 五、發明說明（6 ) 應之故。還有在本實施例中’在離通過位準（thlOUgh levelMdB處之通帶寬，也獲得比以往例要寬約〇·5ΜΗζ的 效果。這樣，藉由使IDT內的電極指的金屬化比在彈性表 面波的傳播方向連續變化，可獲得橫向響應降低、通帶高 頻側附近的衰減量有改善之縱稱合δ皆振描1型彈性表面波濾 波器。 在第1實施例中，係在IDT102，103 ’ 104全部的IDT 中，使電極指的金屬化比連續變化，但使電極指的金屬化 比變化者，即使不是在全部的IDT中也可以得到同樣的效 果。 圖5是表示第2實施例的縱耦合諧振器型彈性表面波 濾波器的各個IDT的金屬化比變化的曲線圖。 如圖5所示，在第2實施例中，IDT103的金屬化比不 變化，使IDT102、104的電極指的金屬化比連續地變化。 具體而言，對於IDT102，從左端起向右方向使電極指的金 屬化比從0.54到0.73連續變化著。還有，對於IDT104， 從左端起向右方向使電極指的金屬化比從0.73到0.54連續 變化著。又，IDT103的金屬比率固定爲0.73。這時，除金 屬化比的變化方式和將IDT的交叉寬度設爲40.5λΙ1外， 縱親合§皆振器型弾性表面波爐波器的構成是與第1實施例 相同的。 在圖6中表示第2實施例的縱耦合諧振器型彈性表面 波濾波器的頻率一振幅特性。在這個第2實施例中，與以 往的構成相比較，在通帶高頻側的990〜1020MHz (在圖6 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填寫本頁)The Zhang scale is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 public love) A7 567665 _____B7 _ V. Description of the invention (+) is smaller than the other parts of the IDT, and constitutes a narrow-pitch electrode finger. In addition, in Fig. 1 (a), for the sake of simplicity, only a small number of electrode fingers are shown. The longitudinally coupled resonator-type surface acoustic wave filter 101 of the first embodiment changes the metallization ratio of each IDT. Here, as shown in FIG. 1 (b), when the width of the electrode fingers of the IDT is dl and the interval width of the electrode fingers is d2, the metallization ratio is represented by d = dl / (dl + d2) 値d. Fig. 2 is a graph showing changes in metallization ratios of each IDT of a longitudinally coupled resonator-type surface acoustic wave filter according to the first embodiment. The metallization ratio of the electrode fingers of each of the IDTs 102, 103, and 104 of the longitudinally coupled resonator-type surface acoustic wave filter 101 of the first embodiment has a characteristic of continuously changing in a range from 0.54 to 0 · 73 as shown in FIG. 2 . Specifically, for the IDT 102, the metallization ratio of the electrode fingers is continuously changed from 0.54 to 0.73 from the left end to the right. For IDT103, from the left end of IDT103 to the center, it changes continuously from 0.73 to 0.54, and from the center of IDT103 to the right, it continuously changes from 0.54 to 0.73. Furthermore, for IDT104, the metallization ratio of the electrode fingers is continuously changed from 0.73 to 0.54 from the left end to the right. Another detailed configuration of the longitudinally-coupled resonator-type surface acoustic wave filter 101 is as follows when the wavelength determined by the pitch of the narrow-pitch electrode fingers is λII, and the wavelength determined by the pitch of the other electrode fingers is λΐΐ. Cross width W: 47.7λΙ1 IDT102 electrode fingers: 27 (4 of them from the right are (please read the precautions on the back before filling this page) 0 ---- I--Order --- ------ Line I should comply with Chinese National Standard (CNS) A4 specification (210 X 297 mm) A7 567665 ___B7____ V. Description of the invention (female) Narrow-pitch electrode fingers.) IDT203 number of electrode fingers ·· 35 (4 of them from the left, 4 of them are narrow-pitch electrode fingers.) IDT104 electrode fingers: 27 (of which, 4 from the left are narrow-pitch electrode fingers) ) IDT wavelengths λΐΐ: 4.19μιη, λΙ2: 3.86μιη Wavelengths of reflectors 105, 106 XR: Both 4.26μηι Reflectors 105, 106: 120 IDT-IDT intervals (Figure 1) (a, 109, 110) ····· 50λΙ2 IDT—Reflector interval: 0.52λΙΙ The metallization ratio of the reflector: 0.55 Electrode film thickness: 0.08λΙ1 The frequency-amplitude characteristic of the first embodiment is shown in FIG. 3. For comparison, in the configuration of FIG. 1 (a), a longitudinally coupled resonator-type surface acoustic wave filter having a conventional configuration in which the metallization ratio of the IDT is 0.73 is used, and this longitudinally coupled resonance is shown in FIG. 4. -Amplitude characteristics of a surface acoustic wave filter. In addition, the detailed structure of the longitudinally coupled resonator-type surface acoustic wave filter of the conventional structure is the same as that of the first embodiment shown above, but the cross width is changed from 47.UI1 of the embodiment in order to obtain impedance matching. The difference of 35.8λI1 is different. Comparing FIG. 3 with FIG. 4, in the first embodiment, the attenuation amount of 990 to 1020 MHz (in the hatched part in FIGS. 3 and 4) on the high-frequency side of the passband is compared with the conventional configuration shown in FIG. 4. There is an improvement of about 4dB. This is because the metallization ratio of the electrode fingers in the IDT is continuously changed and the lateral response is reduced. _ 7 _ —_ This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) (please read the back first) Please pay attention to this page before filling in this page) ------- Order --------- line "567665 A7 B7____ V. Description of Invention (6) The reason should be. Also in this embodiment, the pass bandwidth at thlOUgh level (MdB) is also wider than the conventional example by about 0.5 MHz. In this way, by making the metallization ratio of the electrode fingers in the IDT within The propagation direction of the surface acoustic wave is continuously changed to obtain a vertical and horizontal δ-type 1 surface acoustic wave filter with reduced lateral response and improved attenuation near the high-frequency side of the passband. In the first embodiment, the system In all IDTs 102 and 103 '104, the metallization ratio of the electrode fingers is continuously changed, but the same effect can be obtained even if the metallization ratio of the electrode fingers is not changed in all IDTs. Figure 5 shows A graph showing changes in the metallization ratio of each IDT of the longitudinally coupled resonator-type surface acoustic wave filter of the second embodiment. As shown in FIG. 5, in the second embodiment, the metallization ratio of IDT103 does not change, so that IDT102 The metallization ratio of the electrode fingers continuously changes from 104 to 104. Specifically, for the IDT102, the metallization ratio of the electrode fingers continuously changes from 0.54 to 0.73 from the left end. In addition, for the IDT104, from the left end Right The metallization ratio of the electrode fingers is continuously changed from 0.73 to 0.54. In addition, the metal ratio of IDT103 is fixed at 0.73. At this time, in addition to the way of changing the metallization ratio and the IDT cross width is set to 40.5λΙ1, vertical affinity § The structure of the all-oscillator type surface acoustic wave furnace is the same as that of the first embodiment. Fig. 6 shows the frequency-amplitude characteristics of the longitudinally coupled resonator-type surface acoustic wave filter of the second embodiment. Here, In the second embodiment, compared with the conventional structure, the high-frequency side of the passband is 990 to 1020 MHz (in Figure 6 this paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) (Please read first (Notes on the back then fill out this page)
567665 A7 ____ B7_ 五、發明說明（7 ) 中斜線部分）處衰減量有所改善。而且在離通過位準4dB 處之通帶寬度，比以往的構成要寬約2MHz。這樣，使電 極指的金屬化比變化者，就算不是全部的IDT，仍可獲得 與第1實施例相同的效果。 還有，在第1實施例和第2實施例中係使電極指的金 屬化比連續地變化，但即使不是連續地變化，也能獲得本 發明的效果。 圖7是表示第3實施例的縱耦合諧振器型彈性表面波 濾波器的各個IDT的金屬化比變化的曲線圖。在這個第3 實施例中，使電極指的金屬化比呈非連續變化。具體而言 ，IDT102，104的金屬化比以0.73爲基本，約每隔2個設 爲0.584。而IDT103之金屬化比是固定爲0.73。這時，除 金屬化比變化方式和將IDT的交叉寬度設爲40.5λΙ1外， 是與第1實施例和第2實施例相同的。 還有，圖8表示第3實施例的縱耦合諧振器型彈性表 面波濾波器的頻率一振幅特性。該第3實施例的縱耦合諧 振器型彈性表面波濾波器。雖無法達到第1實施例和第2 實施例的縱耦合諧振器型彈性表面波濾波器那麼好的效果 ，但與以往的構成相比較，在通帶高頻側的990〜1020MHz (在圖8的斜線部分）處衰減量仍有所改善。.567665 A7 ____ B7_ 5. The attenuation at the diagonal line in the description of the invention (7) has been improved. In addition, the passband width at 4dB from the pass level is about 2MHz wider than the conventional configuration. Thus, even if not all the IDTs are changed for the metallization ratio of the electrode fingers, the same effects as those of the first embodiment can be obtained. In the first embodiment and the second embodiment, the metallization ratio of the electrode fingers is continuously changed, but the effects of the present invention can be obtained even if the metalization ratio of the electrode fingers is not continuously changed. Fig. 7 is a graph showing changes in metallization ratios of each IDT of a longitudinally coupled resonator-type surface acoustic wave filter according to a third embodiment. In this third embodiment, the metallization ratio of the electrode fingers is changed discontinuously. Specifically, the metallization ratios of IDT 102 and 104 are based on 0.73, and are set to 0.584 at every other two. The metallization ratio of IDT103 is fixed at 0.73. At this time, it is the same as the first embodiment and the second embodiment except that the change pattern of the metallization ratio and the cross width of the IDT are set to 40.5λ11. Fig. 8 shows the frequency-amplitude characteristics of the longitudinally coupled resonator-type elastic surface wave filter according to the third embodiment. The longitudinally coupled resonator-type surface acoustic wave filter of the third embodiment. Although not as good as the longitudinally coupled resonator-type surface acoustic wave filters of the first and second embodiments, compared with the conventional configuration, the high-frequency side of the passband is 990 to 1020 MHz (in FIG. 8) (Slashed part of) is still improved. .
亦即，即使在第3實施例中，藉由使電極指的金屬化 比非連續地變化，可獲得橫向響應降低、通帶高頻側附近 的衰減量有改善之縱耦合諧振器型彈性表面波濾波器。還 有，使電極指的金屬化比非連續地變化的情形，因在IDT —一 ρ 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填寫本頁)That is, even in the third embodiment, by changing the metallization ratio of the electrode fingers discontinuously, it is possible to obtain a longitudinally coupled resonator-type elastic surface with reduced lateral response and improved attenuation near the high-frequency side of the passband. Wave filter. In addition, in the case where the metallization ratio of the electrode fingers is changed discontinuously, because of IDT—a ρ, this paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) (please read the precautions on the back first) (Fill in this page again)
-· ϋ ϋ ϋ n 1· n n^OJ· n ϋ n n ϋ I I n ϋ n ϋ I n ϋ n I ϋ ϋ ϋ n I ϋ ϋ n I ϋ ϋ an I I 567665 B7 五、發明說明（X ) 內形成不連續的位置而使通帶內的插入損耗變大，因此， 理想上係如第1實施例或者第2實施例般呈連續變化爲較 佳。 在本發明的各個實施例中，係在IDT全體的範圍使金 屬化比變化，但藉由將電極指的金屬化比變化位置形成在 IDT之鄰接部分到IDT的1/4左右爲止的區域，可進一步 降低橫向響應，而加大通帶高頻側的衰減量。 在本發明的各個實施例中，使用40i：5°YcutX傳播 LiTaCh基板，本發明不限於這種基板，例如，64〜 72°YcutX傳播LiNbCh基板或者41QYcutX傳播LiNbCh基板 也獲得相同的效果。還有，在本發明中以3IDT型縱耦合諧 振器型彈性表面波濾波器的例子來說明的，即使其他構成 也能取得相同的效果。例如，即使採用2個IDT的2IDT構 成或採用4個、5個或者其以上的多ID構成、還有，將本 發明的縱耦合諧振器型彈性表面波濾波器2段串聯而成的 構成，也能獲得相同的效果。還有，將一端子對彈性表面 諧振器作串聯或並聯地附加亦可。 還有，將本發明的第1實施例到第3實施例所示的縱 耦合諧振器型彈性表面波濾波器應用到具有平衡一不平衡 信號變化功能的縱耦合諧振器型彈性表面波瀘波器，將可 獲得具備平衡一不平衡信號轉換功能、通帶高頻側附近的 衰減量大的縱耦合諧振器型彈性表面波濾波器。 從圖9到圖12中，分別表示具有平衡一不平衡信號轉 換功能的本發明的縱耦合諧振器型彈性表面波濾波器的構 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填寫本頁) 0--------訂---------線-------------------------- 567665 A7 ____B7____ 五、發明說明（7 ) 成。 在圖9中表示第4實施例的具備平衡一不平衡信號轉 換功能的縱稱合諧振器型彈性表面波濾波器。第4實施例 的縱耦合諧振器型彈性表面波濾波器301，係將和圖1(a)所 示的第1實施例的縱耦合諧振器型彈性表面波濾波器101 大體相同構成的縱耦合諧振器型彈性表面波濾波器兩個並 聯而構成。在圖9中，與圖i(a)不同點在於，右側的縱耦 合諧振器型彈性表面波濾波器之三個IDT(從左起依序爲 305、306，307 )中IDT306的上下方向相反。縱耦合諧振 器型彈性表面波濾波器301，其IDT302、304、305、307的 對向電極指群的一方連接於不平衡端子201，IDT303的對 向電極指群的一方連接於平衡端子202, IDT306的對向電 極指群的一方連接於平衡端子203而構成。 然後’在圖10中表示第5實施例的具備平衡一不平衡 信號轉換功能的縱耦合諧振器型彈性表面波濾波器。第5 實施例的縱耦合諧振器型彈性表面波濾波器401是與圖 1(a)所示的第1實施例的縱耦合諧振器型彈性表面波濾波器 101同樣構成的，三個IDT (從左起依序爲402、403、404 )中，IDT403與平衡端子、與不平衡端子的連接爲其特徵 所在。亦即’ IDT403的對向電極指群的一方與平衡端子 202連接，IDT403的對向電極指群的另一方與平衡端子203 連接著。還有，IDT402、404的對向電極指群的一方是與 不平衡端子201連接而構成。 然後，在圖11中表示第6實施例的具備平衡一不平衡 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填寫本頁) _· 丨訂---------線丨_-------------------- A7 567665 _______B7_ 五、發明說明（θ ) (請先閱讀背面之注意事項再填寫本頁) 信號轉換功能的縱耦合諧振器型彈性表面波濾波器。第6 實施例的縱耦合諧振器型彈性表面波濾波器501是基本上 與圖1(a)所示的第1實施例的縱耦合諧振器型彈性表面波 濾波器101相同的構成。不同之處是在三個IDT (從左起 依序爲502、503、504)中使IDT504的上下方向相反之點 ，以及在IDT503的中央附近，實施電極翻轉而使相鄰電極 指的方向相同之點。這個縱耦合諧振器型彈性表面波濾波 器501，其IDT502、504的對向電極指群的一方與不平衡端 子201連接。還有，IDT503之比實施IDT電極翻轉位置更 左側的對向電極指群的一方與平衡端子202連接。又， IDT503之比實施IDT電極翻轉位置更右側的對向電極指群 的一方與平衡端子203連接而構成的。 還有，在圖12中表示第7實施例的具備平衡一不平衡 信號轉換功能的縱耦合諧振器型彈性表面波濾波器。'第7 實施例的縱耦合諧振器型彈性表面波濾波器601是基本上 與圖1(a)所示的第1實施例的縱耦合諧振器型彈性表面波 濾波器101相同的構成。不同之處是在三個IDT(從左起 依序爲602、603、604)中，使IDT604的上下方向相反之 點。這個縱耦合諧振器型彈性表面波濾波器601的IDT602 的對向電極指群的一方與平衡端子202連接，還有， IDT604的對向電極指群的一方與平衡端子203連接。又， IDT603的對向電極指群的一方與不平衡端子201連接而構 成的。 如上述，例如如第4實施例到第7實施例所示般，藉 ^--u--- 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） A7 567665 _____B7_— 五、發明說明（Μ ) 由使縱耦合諧振器型彈性表面波濾波器具備平衡一不平衡 信號轉換功能而構成，將能獲得具備平衡一不平衡信號轉 換功能、通帶高頻側的衰減量大的縱耦合諧振器型彈性表 面波濾波器。 圖13是表示裝載著本發明的縱耦合諧振器型彈性表面 波濾波器而成之通訊機160的一實施例的槪略方塊圖。 在圖13中，在天線161上連接著收發雙工器162。在 收發雙工器162與接收側混頻器163之間連接著縱耦合諧 振器型彈性表面波濾波器164及放大器165。還有，在收 發雙工器162與發送側的混頻器i66之間連接著放大器ι67 和縱耦合諧振器型彈性表面波濾波器168。這樣，當放大 器165對應於平衡信號時，藉由採用本發明的構成所組成 的縱親合諧振器型彈性表面波濾波器來作爲縱耦合諧振器 型彈性表面波濾波器164，能獲得通信品質佳、可靠性高 的通訊機裝置。 〔發明之效果〕 依據上述般之本發明，能獲得降低橫向的響應、通帶 高頻側的衰減量大的縱耦合諧振器型彈性表面波濾波器。 這時，藉由電極指的金屬化在彈性表面波的傳播方向連續 變化的位置形成在從IDT鄰接的部分到IDT的1/4左右的 區域，可獲得充分的效果。又，藉由使電極指的金屬化比 在彈性表面波的傳播方向呈連續變化，可不致加大通帶內 插入損耗，而獲得本發明的更佳效果。 還有’藉由在通訊機裝置中使用本發明的縱耦合諧振 —— ------u_ 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填寫本頁)-· Ϋ ϋ ϋ n 1 · nn ^ OJ · n ϋ nn ϋ II n ϋ n ϋ I n ϋ n I ϋ ϋ I n I ϋ ϋ n I ϋ ϋ an II 567665 B7 V. Description of the invention (X) The discontinuous position increases the insertion loss in the passband. Therefore, it is preferable to change continuously as in the first embodiment or the second embodiment. In each embodiment of the present invention, the metallization ratio is changed in the entire IDT range. However, the position of the metallization ratio of the electrode fingers is formed in a region adjacent to the IDT to about 1/4 of the IDT. It can further reduce the lateral response and increase the amount of attenuation on the high-frequency side of the passband. In various embodiments of the present invention, a 40i: 5 ° YcutX propagation LiTaCh substrate is used. The present invention is not limited to such substrates, for example, a 64 ~ 72 ° YcutX propagation LiNbCh substrate or a 41QYcutX propagation LiNbCh substrate also achieves the same effect. In addition, in the present invention, a description is given by taking an example of a 3IDT type longitudinally coupled resonator-type surface acoustic wave filter, and the same effect can be obtained even with other configurations. For example, even if a 2 IDT configuration of 2 IDTs or a multi ID configuration of 4, 5 or more is used, and a configuration in which two segments of the longitudinally coupled resonator-type surface acoustic wave filter of the present invention are connected in series, The same effect can be obtained. Alternatively, one terminal may be added to the surface acoustic resonator in series or in parallel. Furthermore, the longitudinally coupled resonator-type surface acoustic wave filters shown in the first to third embodiments of the present invention are applied to a longitudinally coupled resonator-type surface acoustic wave filter having a balanced-unbalanced signal change function. This device will provide a longitudinally coupled resonator-type surface acoustic wave filter with a balanced-unbalanced signal conversion function and a large attenuation near the high-frequency side of the passband. From FIG. 9 to FIG. 12, the structure of the longitudinally-coupled resonator-type surface acoustic wave filter of the present invention with balanced-unbalanced signal conversion functions are shown respectively. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297). (Mm) (Please read the notes on the back before filling out this page) 0 -------- Order --------- Line -------------- ------------ 567665 A7 ____B7____ 5. Description of the invention (7). Fig. 9 shows a longitudinally coupled resonator-type surface acoustic wave filter having a balanced-unbalanced signal conversion function according to a fourth embodiment. The longitudinally-coupled resonator-type surface acoustic wave filter 301 of the fourth embodiment is a longitudinally-coupled resonator having substantially the same configuration as the longitudinally-coupled resonator-type surface acoustic wave filter 101 of the first embodiment shown in FIG. 1 (a). Two resonator-type surface acoustic wave filters are configured in parallel. In FIG. 9, the difference from FIG. I (a) is that the IDT 306 in the three IDTs of the longitudinally coupled resonator-type surface acoustic wave filter on the right side (sequentially from the left is 305, 306, and 307) is opposite to each other. . The longitudinally coupled resonator-type surface acoustic wave filter 301 has one of the counter electrode finger groups of IDT 302, 304, 305, and 307 connected to the unbalanced terminal 201, and one side of the counter electrode finger group of IDT 303 is connected to the balanced terminal 202, One of the counter electrode finger groups of the IDT 306 is connected to the balanced terminal 203. Next, FIG. 10 shows a longitudinally coupled resonator-type surface acoustic wave filter having a balanced-unbalanced signal conversion function according to the fifth embodiment. The longitudinally coupled resonator-type surface acoustic wave filter 401 of the fifth embodiment is the same as the longitudinally coupled resonator-type surface acoustic wave filter 101 of the first embodiment shown in FIG. 1 (a). Three IDT ( From left to right (402, 403, 404), the connection between IDT403 and balanced terminals and unbalanced terminals is its characteristic. That is, one side of the counter electrode finger group of IDT403 is connected to the balanced terminal 202, and the other side of the counter electrode finger group of IDT403 is connected to the balanced terminal 203. One of the counter electrode finger groups of IDTs 402 and 404 is connected to the unbalanced terminal 201. Then, FIG. 11 shows that the sixth embodiment is equipped with a balanced-unbalanced paper. The paper size applies the Chinese National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back before filling this page) _ · 丨 Order --------- Line 丨 _-------------------- A7 567665 _______B7_ V. Description of the Invention (θ) (Please read the back first (Notes on this page, please fill out this page)) Vertically coupled resonator type surface acoustic wave filter with signal conversion function. The longitudinally coupled resonator-type surface acoustic wave filter 501 of the sixth embodiment is basically the same as the longitudinally coupled resonator-type surface acoustic wave filter 101 of the first embodiment shown in Fig. 1 (a). The difference is that in the three IDTs (sequentially from the left, 502, 503, and 504) the opposite direction of the IDT504 is reversed, and near the center of the IDT503, the electrode is reversed to make the directions of adjacent electrode fingers the same Point. This longitudinally-coupled resonator-type surface acoustic wave filter 501 has one of the counter electrode finger groups of IDTs 502 and 504 connected to an unbalanced terminal 201. The counter electrode finger group on the left side of the IDT 503 is more connected to the balanced terminal 202 than the IDT electrode inversion position. In addition, one of the counter electrode finger groups on the right side of the IDT 503 than the IDT electrode inversion position is connected to the balanced terminal 203. Fig. 12 shows a longitudinally coupled resonator-type surface acoustic wave filter having a balanced-unbalanced signal conversion function according to a seventh embodiment. 'The longitudinally coupled resonator-type surface acoustic wave filter 601 of the seventh embodiment has basically the same configuration as the longitudinally coupled resonator-type surface acoustic wave filter 101 of the first embodiment shown in Fig. 1 (a). The difference is that among the three IDTs (602, 603, and 604 in order from the left), the vertical direction of the IDT 604 is opposite. One of the counter electrode finger groups of the IDT 602 of the longitudinally coupled resonator-type surface acoustic wave filter 601 is connected to the balanced terminal 202, and one of the counter electrode finger groups of the IDT 604 is connected to the balanced terminal 203. In addition, one of the counter electrode finger groups of the IDT 603 is connected to the unbalanced terminal 201. As mentioned above, for example, as shown in the fourth embodiment to the seventh embodiment, the paper size applies to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) A7 567665 _____ B7_— 5 Description of the invention (M) It is composed of a longitudinally coupled resonator-type surface acoustic wave filter with a balanced-unbalanced signal conversion function, which can obtain a balanced-unbalanced signal conversion function and a large attenuation at the high-frequency side of the passband. A longitudinally coupled resonator-type surface acoustic wave filter. Fig. 13 is a schematic block diagram showing an embodiment of a communication device 160 including a longitudinally coupled resonator-type surface acoustic wave filter according to the present invention. In FIG. 13, a transmitting / receiving duplexer 162 is connected to the antenna 161. A longitudinally coupled resonator-type surface acoustic wave filter 164 and an amplifier 165 are connected between the transmitting-receiving duplexer 162 and the receiving-side mixer 163. An amplifier ι67 and a longitudinally coupled resonator-type surface acoustic wave filter 168 are connected between the transmitting / receiving duplexer 162 and the transmitting-side mixer i66. In this way, when the amplifier 165 corresponds to a balanced signal, by using the longitudinally-coupled resonator-type surface acoustic wave filter composed of the configuration of the present invention as the longitudinal-coupled resonator-type surface acoustic wave filter 164, communication quality can be obtained Good and reliable communication equipment. [Effects of the Invention] According to the present invention as described above, it is possible to obtain a longitudinally coupled resonator-type surface acoustic wave filter with reduced lateral response and large attenuation at the high-frequency side of the passband. At this time, the position where the propagation direction of the surface acoustic wave is continuously changed by the metallization of the electrode finger is formed in a region from a portion adjacent to the IDT to about 1/4 of the IDT, and a sufficient effect can be obtained. Moreover, by continuously changing the metallization ratio of the electrode fingers in the propagation direction of the surface acoustic wave, the insertion loss in the passband can be prevented from increasing, and a better effect of the present invention can be obtained. And 'by using the longitudinal coupling resonance of the present invention in a communicator device------- u_ This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) (Please read the back first (Notes for filling in this page)
--------^---------^ II 567665 a/ _____ _____ 五、發明說明（α ) 器型彈性表面波濾波器，所以能獲得通信品質佳、可靠性 高的通訊機裝置。 〔圖式之簡單說明〕 圖1(a)表示本發明的第一實施例的縱耦合諧振器彈性 表面波濾波器的槪略圖。 圖1(b)係說明金屬化比的匱I ° 圖2表示本發明的第一實施例的縱耦合諧振器彈性表 面波濾波器的各IDT的金屬化比變化的曲線圖。 圖3表示本發明的第一實施例的縱耦合諧振器型彈性 表面波濾波器的頻率一振幅特性的曲線圖。 圖4表示在以往的構成中的縱耦合諧振器型彈性表面 波濾波器的頻率一振幅特性的曲線圖。 圖5表示本發明的第二實施例的縱耦合諧振器型彈性 表面波濾波器的各IDT的金屬化比的變化的曲線圖。 圖6表示本發明的第二實施例的縱耦合諧振器型彈性 表面波濾波器的頻率一振幅特性的曲線圖。 圖7表示本發明的第3實施例的縱耦合諧振器型彈性 表面波濾波器的各IDT的金屬化比的變化的曲線圖。 圖8表不本發明的第3實施例的縱親合諧振器型彈性 表面波濾波器的頻率一振幅特性的曲線圖。 圖9表示本發明的第4實施例的縱耦合諧振器型彈性 表面波濾波器的槪略圖。 圖10表示本發明的第5實施例的縱耦合諧振器型彈性 表面波濾波器的槪略圖。 --—-U—-— __ 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） ' (請先閱讀背面之注意事項再填寫本頁) ·I —丨丨丨丨訂·！------*5^」 567665 A7-------- ^ --------- ^ II 567665 a / _____ _____ V. Description of the invention (α) A device-type surface acoustic wave filter, so it can obtain good communication quality and high reliability Communicator device. [Brief Description of the Drawings] Fig. 1 (a) is a schematic diagram showing a longitudinally coupled resonator surface acoustic wave filter according to a first embodiment of the present invention. Fig. 1 (b) is a graph illustrating the metallization ratio I °. Fig. 2 is a graph showing changes in the metallization ratio of each IDT of the longitudinally coupled resonator elastic surface wave filter according to the first embodiment of the present invention. Fig. 3 is a graph showing a frequency-amplitude characteristic of a longitudinally coupled resonator-type surface acoustic wave filter according to a first embodiment of the present invention. Fig. 4 is a graph showing a frequency-amplitude characteristic of a longitudinally coupled resonator-type surface acoustic wave filter in a conventional configuration. Fig. 5 is a graph showing a change in metallization ratio of each IDT of a longitudinally coupled resonator-type surface acoustic wave filter according to a second embodiment of the present invention. Fig. 6 is a graph showing a frequency-amplitude characteristic of a longitudinally coupled resonator-type surface acoustic wave filter according to a second embodiment of the present invention. Fig. 7 is a graph showing changes in metallization ratios of each IDT of a longitudinally coupled resonator-type surface acoustic wave filter according to a third embodiment of the present invention. Fig. 8 is a graph showing a frequency-amplitude characteristic of a longitudinal affinity resonator-type surface acoustic wave filter according to a third embodiment of the present invention. Fig. 9 is a schematic diagram showing a longitudinally coupled resonator-type surface acoustic wave filter according to a fourth embodiment of the present invention. Fig. 10 is a schematic diagram showing a longitudinally coupled resonator-type surface acoustic wave filter according to a fifth embodiment of the present invention. ---- U —-— __ This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) '(Please read the precautions on the back before filling this page) · I — 丨 丨 丨 丨 Order ·! ------ * 5 ^ '' 567665 A7
__B7_ 五、發明說明（6 ) 圖11表示本發明的第6實施例的縱耦合諧振器型彈性 表面波濾波器的槪略圖。 圖12表示本發明的第7實施例的縱耦合諧振器型彈性 表面波濾波器的槪略圖。 圖13是裝載本發明的縱耦合諧振器型彈性表面波濾波 器的通訊機裝置的槪略方塊圖。 〔符號說明〕 101，301，401，501，601 縱耦合諧振器型彈性表面波濾 波器 105，106 反射器 201 不平衡端子 202，203 平衡端子 102 · 103，104，302，303，304，305，306，307，402， 403，404，502，503，504，602，603，604 IDT (請先閱讀背面之注意事項再填寫本頁) 麵 ^_______!線________!.______________ 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐）__B7_ 5. Description of the Invention (6) FIG. 11 shows a schematic diagram of a longitudinally coupled resonator-type surface acoustic wave filter according to a sixth embodiment of the present invention. Fig. 12 is a schematic diagram showing a longitudinally coupled resonator-type surface acoustic wave filter according to a seventh embodiment of the present invention. Fig. 13 is a schematic block diagram of a communicator apparatus incorporating a longitudinally coupled resonator-type surface acoustic wave filter according to the present invention. [Description of symbols] 101, 301, 401, 501, 601 Vertically coupled resonator-type surface acoustic wave filters 105, 106 Reflector 201 Unbalanced terminal 202, 203 Balanced terminal 102 · 103, 104, 302, 303, 304, 305 , 306, 307, 402, 403, 404, 502, 503, 504, 602, 603, 604 IDT (Please read the notes on the back before filling this page) Face ^ _______! Line ________! .______________ This paper size applies China National Standard (CNS) A4 specification (210 X 297 mm)
Claims (1)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001177423 | 2001-06-12 | ||
| JP2002112263A JP3780415B2 (en) | 2001-06-12 | 2002-04-15 | Longitudinal coupled resonator type surface acoustic wave filter and communication device using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| TW567665B true TW567665B (en) | 2003-12-21 |
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ID=26616779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW091111413A TW567665B (en) | 2001-06-12 | 2002-05-29 | Longitudinally-coupled resonator surface acoustic wave filter and communication system using the filter |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6720847B2 (en) |
| EP (1) | EP1267490A3 (en) |
| JP (1) | JP3780415B2 (en) |
| KR (1) | KR20020095121A (en) |
| CN (1) | CN1391344A (en) |
| TW (1) | TW567665B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004048675A (en) * | 2002-05-15 | 2004-02-12 | Murata Mfg Co Ltd | Surface acoustic wave device, and communication device containing the same |
| JP2004304513A (en) | 2003-03-31 | 2004-10-28 | Matsushita Electric Ind Co Ltd | Surface acoustic wave device |
| US7158763B2 (en) * | 2003-05-02 | 2007-01-02 | P. J. Edmonson Ltd. | Multi-IDT SAW hybrid communication system |
| WO2005031971A1 (en) * | 2003-09-25 | 2005-04-07 | Murata Manufacturing Co., Ltd. | Surface acoustic wave filter and communication unit |
| DE102008037091A1 (en) | 2008-08-08 | 2010-02-11 | Epcos Ag | SAW device |
| CN102197591B (en) * | 2008-10-24 | 2014-05-14 | 精工爱普生株式会社 | Surface acoustic wave resonator, surface acoustic wave oscillator, and surface acoustic wave module device |
| DE102010046794B4 (en) * | 2010-09-28 | 2015-07-16 | Epcos Ag | Acoustic waves filter with reduced nonlinearities |
| CN106416068B (en) * | 2014-06-10 | 2019-03-29 | 株式会社村田制作所 | Acoustic wave device |
| WO2023002948A1 (en) * | 2021-07-20 | 2023-01-26 | 株式会社村田製作所 | Reception filter and composite filter device |
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| ATE85869T1 (en) * | 1986-08-29 | 1993-03-15 | Siemens Ag | SURFACE WAVE RESONATOR STRUCTURE WITH PARTIALLY INTERRUPTED METALLIZATION STRIPS OF REFLECTOR FINGERS. |
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| JP3152419B2 (en) | 1991-10-28 | 2001-04-03 | 富士通株式会社 | Surface acoustic wave filter |
| US5392013A (en) * | 1992-07-17 | 1995-02-21 | Nec Corporation | Surface acoustic wave filter capable of widening a bandwidth |
| DE69323163T2 (en) * | 1992-12-01 | 1999-06-02 | Japan Radio Co Ltd | Acoustic surface wave filter and mobile communication system with such a filter |
| JPH0730363A (en) * | 1993-07-06 | 1995-01-31 | Murata Mfg Co Ltd | Saw resonator filter |
| GB2280806B (en) * | 1993-08-04 | 1997-10-08 | Advanced Saw Prod Sa | Saw filter |
| EP0648015B1 (en) * | 1993-10-08 | 2000-05-31 | Matsushita Electric Industrial Co., Ltd. | Surface acoustic wave filter |
| JP3181475B2 (en) * | 1994-08-12 | 2001-07-03 | ティーディーケイ株式会社 | Surface acoustic wave device |
| JPH07297671A (en) * | 1995-04-14 | 1995-11-10 | Hitachi Ltd | Surface acoustic wave device |
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| KR970077983A (en) * | 1996-05-10 | 1997-12-12 | 곽정소 | Coupled double mode surface acoustic wave filter |
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| JP3227645B2 (en) * | 1996-09-17 | 2001-11-12 | 株式会社村田製作所 | Surface acoustic wave device |
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| CN100386965C (en) * | 1999-06-03 | 2008-05-07 | 松下电器产业株式会社 | SAW filter |
| US6291924B1 (en) * | 1999-07-01 | 2001-09-18 | Trw Inc. | Adjustable saw device |
| JP3454239B2 (en) * | 2000-08-31 | 2003-10-06 | 株式会社村田製作所 | Surface acoustic wave filter |
| JP3412611B2 (en) * | 2000-09-25 | 2003-06-03 | 株式会社村田製作所 | Surface acoustic wave device |
-
2002
- 2002-04-15 JP JP2002112263A patent/JP3780415B2/en not_active Expired - Lifetime
- 2002-05-29 TW TW091111413A patent/TW567665B/en not_active IP Right Cessation
- 2002-06-06 EP EP02291397A patent/EP1267490A3/en not_active Withdrawn
- 2002-06-11 KR KR1020020032490A patent/KR20020095121A/en active Search and Examination
- 2002-06-12 CN CN02124361A patent/CN1391344A/en active Pending
- 2002-06-12 US US10/170,154 patent/US6720847B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1391344A (en) | 2003-01-15 |
| EP1267490A2 (en) | 2002-12-18 |
| US6720847B2 (en) | 2004-04-13 |
| JP3780415B2 (en) | 2006-05-31 |
| KR20020095121A (en) | 2002-12-20 |
| JP2003069384A (en) | 2003-03-07 |
| EP1267490A3 (en) | 2007-06-27 |
| US20020196104A1 (en) | 2002-12-26 |
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